(PHP 8 >= 8.1.0)
sodium_crypto_stream_xchacha20 — Expands the key and nonce into a keystream of pseudorandom bytes
$length, string $nonce, string $key): string
Expands the key and nonce into a keystream of pseudorandom bytes.
lengthNumber of bytes desired.
nonce24-byte nonce.
keyKey, possibly generated from sodium_crypto_stream_xchacha20_keygen().
Returns a pseudorandom stream that can be used with sodium_crypto_stream_xchacha20_xor().